It is hard to analyze trace logs with multiple virtio-blk devices because none of the trace events include the VirtIODevice *vdev.
This patch adds vdev so it's clear which device a request is associated with. I considered using VirtIOBlock *s instead but VirtIODevice *vdev is more general and may be correlated with generic virtio trace events like virtio_set_status. Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> --- hw/block/virtio-blk.c | 12 +++++++----- hw/block/trace-events | 10 +++++----- 2 files changed, 12 insertions(+), 10 deletions(-) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 604d37d..c0bd247 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -50,7 +50,7 @@ static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) VirtIOBlock *s = req->dev; VirtIODevice *vdev = VIRTIO_DEVICE(s); - trace_virtio_blk_req_complete(req, status); + trace_virtio_blk_req_complete(vdev, req, status); stb_p(&req->in->status, status); virtqueue_push(req->vq, &req->elem, req->in_len); @@ -88,12 +88,13 @@ static void virtio_blk_rw_complete(void *opaque, int ret) { VirtIOBlockReq *next = opaque; VirtIOBlock *s = next->dev; + VirtIODevice *vdev = VIRTIO_DEVICE(s); aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); while (next) { VirtIOBlockReq *req = next; next = req->mr_next; - trace_virtio_blk_rw_complete(req, ret); + trace_virtio_blk_rw_complete(vdev, req, ret); if (req->qiov.nalloc != -1) { /* If nalloc is != 1 req->qiov is a local copy of the original @@ -355,7 +356,8 @@ static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb, mrb->reqs[i - 1]->mr_next = mrb->reqs[i]; } - trace_virtio_blk_submit_multireq(mrb, start, num_reqs, + trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev), + mrb, start, num_reqs, sector_num << BDRV_SECTOR_BITS, qiov->size, is_write); block_acct_merge_done(blk_get_stats(blk), @@ -526,11 +528,11 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) if (is_write) { qemu_iovec_init_external(&req->qiov, iov, out_num); - trace_virtio_blk_handle_write(req, req->sector_num, + trace_virtio_blk_handle_write(vdev, req, req->sector_num, req->qiov.size / BDRV_SECTOR_SIZE); } else { qemu_iovec_init_external(&req->qiov, in_iov, in_num); - trace_virtio_blk_handle_read(req, req->sector_num, + trace_virtio_blk_handle_read(vdev, req, req->sector_num, req->qiov.size / BDRV_SECTOR_SIZE); } diff --git a/hw/block/trace-events b/hw/block/trace-events index 65e83dc..c332c01 100644 --- a/hw/block/trace-events +++ b/hw/block/trace-events @@ -1,11 +1,11 @@ # See docs/tracing.txt for syntax documentation. # hw/block/virtio-blk.c -virtio_blk_req_complete(void *req, int status) "req %p status %d" -virtio_blk_rw_complete(void *req, int ret) "req %p ret %d" -virtio_blk_handle_write(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu" -virtio_blk_handle_read(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu" -virtio_blk_submit_multireq(void *mrb, int start, int num_reqs, uint64_t offset, size_t size, bool is_write) "mrb %p start %d num_reqs %d offset %"PRIu64" size %zu is_write %d" +virtio_blk_req_complete(void *vdev, void *req, int status) "vdev %p req %p status %d" +virtio_blk_rw_complete(void *vdev, void *req, int ret) "vdev %p req %p ret %d" +virtio_blk_handle_write(void *vdev, void *req, uint64_t sector, size_t nsectors) "vdev %p req %p sector %"PRIu64" nsectors %zu" +virtio_blk_handle_read(void *vdev, void *req, uint64_t sector, size_t nsectors) "vdev %p req %p sector %"PRIu64" nsectors %zu" +virtio_blk_submit_multireq(void *vdev, void *mrb, int start, int num_reqs, uint64_t offset, size_t size, bool is_write) "vdev %p mrb %p start %d num_reqs %d offset %"PRIu64" size %zu is_write %d" # hw/block/hd-geometry.c hd_geometry_lchs_guess(void *blk, int cyls, int heads, int secs) "blk %p LCHS %d %d %d" -- 2.9.4